原位聚合法制备的聚醚醚酮/膨胀石墨复合材料及性能

In-Situ Polymerized Polyetheretherketone/Expanded Graphite Composites and Their Properties

以膨胀石墨(EG)负载对苯二酚后和4,4′-二氟二苯甲酮单体,采用原位亲核缩聚法制备了聚醚醚酮/膨胀石墨复合材料(PEEK/EG)。通过黏度分析法探讨了膨胀石墨对PEEK相对分子质量的影响;采用X射线衍射、差示扫描量热分析和热重分析研究了膨胀石墨对PEEK结晶性能和热性能的影响;通过扫描电镜表征了膨胀石墨在PEEK基体中的分散形态;通过摩擦测试仪研究了PEEK及PEEK/EG摩擦性能。结果表明,原位缩聚过程中引入EG不会影响PEEK晶型;EG含量为0.5%时PEEK/EG复合材料初始分解温度提高10℃,同时,EG在基体中分散效果良好。PEEK/EG-0.5%的磨损率为4.00×10-6 mm2/(N·m),远低于纯PEEK的15.80×10-6 mm2/(N·m)。

Hydroquinone and 4,4′-difluoro diphenylmethanone loaded with expanded graphite(EG)were used as monomer to prepare poly(ether ether ketone)(PEEK)by in-situ condensation polymerization in the solvent of diphenyl sulfone.Effects of EG addition concentration on crystallization and thermal properties of PEEK/EG composites were conducted by X-ray diffraction(XRD),differential scanning calorimetry(DSC)and thermo gravimetric analyzer(TGA).The dispersion state of EG in PEEK matrix was detected through scanning electron microscope(SEM).The wear resistance was tested by friction wear testing machine.The results show that molecular weight of PEEK is lowing with increasing the addition concentration of EG.The crystal structure is not affected by EG.The original decomposition temperature of PEEK/EG composites is increased by 10 ℃ with 0.5%EG and EG is dispersed well in the matrix.The wear rate of PEEK/EG-0.5%is 4.00×10-6 mm2/(N·m),which is far lower than that of PEEK(15.80×10-6 mm2/(N·m)).